13 letters
- lymphosarcoma30
- magnetographs26
- magnetosphere24
- mammographies29
- mastigophoran24
- mesencephalic29
- mesencephalon27
- metallography27
- metallophones24
- metamorphisms27
- metamorphosed25
- metamorphoses24
- metamorphosis24
- metaphosphate26
- metaphysician27
- metencephalic29
- metencephalon27
- microcephalic31
- micrographics29
- micrographing29
- microphyllous29
- microphysical30
- mimeographing29
- misemphasized34
- misemphasizes33
- monomorphemic31
- monomorphisms28
- monophthongal28
- morphemically31
- morphogeneses24
- morphogenesis24
- morphogenetic27
- morphological28
- morphologists24
- morphometries24
- mycetophagous29
- myelencephala29
- myrmecophiles30
- mythographers27
- mythographies27
- naphthylamine28
- nasopharynges24
- nasopharynxes29
- necrophiliacs26
- necrophilisms26
- nephelometers23
- nephelometric26
- nephrectomies25
- nephrectomize34
- nephrologists22
- nephropathies24
- nonalphabetic27
- nonphosphates25
- nonphysicians26
- nympholepsies28
- nymphomaniacs31
- oceanographer24
- oceanographic27
- onychophorans27
- ophthalmology29
- oropharyngeal24
- orthographies22
- oscillographs25
- oscillography27
- overemphasize34
- paedomorphism28
- paleographers24
- paleographies24
- pamphleteered26
- paraphernalia23
- paraphrasable25
- perphenazines32
- petrographers23
- petrographies23
- phagocytizing37
- phagocytosing28
- phalansteries20
- phallocentric27
- phanerophytes26
- pharisaically25
- pharmacognosy29
- pharmacologic30
- pharmacopeial28
- pharmacopeias27
- pharmacopoeia27
- pharyngitides24
- phenanthrenes23
- phencyclidine30
- phenmetrazine32
- phenobarbital26
- phenomenalism27
- phenomenalist24
- phenomenology28
- phenothiazine31
- phentolamines24
- phenylalanine25
- phenylephrine28
- philanthropic28
- philharmonics28
- philhellenism27
- philhellenist24
- philistinisms23
- phillumenists25
- philodendrons23
- philosophical28
- philosophised25
- philosophises24
- philosophized34
- philosophizer33
- philosophizes33
- phlebographic32
- phlebotomists25
- phonographers26
- phonographies26
- phosphatidyls27
- phosphatizing35
- phosphaturias24
- phosphokinase28
- phospholipase27
- phospholipids28
- phosphoresced27
- phosphoresces26
- phosphorylase26
- phosphorylate26
- photobiologic27
- photocathodes24
- photochemical30
- photochemists26
- photochromism29
- photocomposed28
- photocomposer27
- photocomposes27
- photocurrents23
- photodetector22
- photoelectric25
- photoelectron23
- photoemission22
- photoemissive25
- photoengraved26
- photoengraver25
- photoengraves25
- photofinisher24
- photogeologic26
- photographers25
- photographies25
- photographing28
- photogravures25
- photoionizing31
- photomontages24
- photonegative25
- photooxidized36
- photooxidizes35
- photoperiodic25
- photopolymers27
- photopositive25
- photoproducts26
- photoreaction22
- photoreceptor24
- photoreducing26
- photostatting21
- photosynthate23
- phototoxicity30
- phototropisms24
- photovoltaics26
- phragmoplasts27
- phrasemakings28
- phrasemongers24
- phraseologies21
- phraseologist21
- phreatophytes25
- phreatophytic28
- phrenological26
- phrenologists22
- phycoerythrin28
- phycomycetous32
- physicalistic27
- physicalities24
- physiognomies26
- physiographer27
- physiographic30
- physiological27
- physiologists23
- physiotherapy27
- physostigmine26
- phytochemical32
- phytochemists28
- phytohormones26
- phytopathogen28
- phytoplankter29
- phytoplankton30
- phytotoxicity32
- pictographies26
- picturephones26
- planographies25
- pleomorphisms28
- pneumatophore26
- pogonophorans25
- polarographic27
- polygraphists26
- polymorphisms30